<template>

<div>
            <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片 -->
    <el-card>
        <el-row>
            <el-col>
                <el-button type="primary" @click="showaddCateDialog()">添加分类</el-button>
            </el-col>
        </el-row>
        
        <!-- 表格 -->
        <tree-table class="treetable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" :show-index="true" index-text="#" border
        :show-row-hover="false"
        >
        <!-- 是否有效   定义域插槽   isok 为模板名  scope来接收这一列的数据 -->
        <template slot="isok" slot-scope="scope">
            <i class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color: lightgreen"
            ></i>
            <i class="el-icon-error" v-else style="color: red"></i>
        </template>

        <!-- 排序 -->
        <template slot="sort" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
            <el-tag type="success" size="mini" v-else-if="scope.row.cat_level === 1">二级</el-tag>
            <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini" @click="showeditCate(scope.row.cat_id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini" @click="deleCate(scope.row.cat_id)">删除</el-button>
        </template>
        </tree-table>

        <!-- 分页效果 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="querInfo.pagenum"
        :page-sizes="[3, 5, 10, 20]"
        :page-size="querInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total">
    </el-pagination>

    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisiable"
        width="50%"
        @close="addCateDialogClosed"
        >
        
        <!-- 添加分类的表单 -->
        <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
            <el-form-item label="分类名称" prop="cat_name">
                <el-input v-model="addCateForm.cat_name"></el-input>
            </el-form-item>
                <!-- 父级分类 -->
            <el-form-item label="父级分类">
                <!-- options指定数据源  props指定数据对象 -->
                <el-cascader
                    v-model="selectedKeys"
                    :options="parentCateList"
                    :props="cascaderProps"
                    expand-trigger="hover"
                    clearable
                    @change="parentCateChanged">
                </el-cascader>
            </el-form-item>

        </el-form>

        <span slot="footer" class="dialog-footer">
            <el-button @click="addCateDialogVisiable = false">取 消</el-button>
            <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
    </el-dialog>

    <!-- 编辑分类名称的对话框 -->
<el-dialog
    title="修改分类"
    :visible.sync="editCateDialogVisible"
    width="50%"
    @close="editCateClosed"
    >
    <el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef">
        <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
    </el-form>

  <span slot="footer" class="dialog-footer">
    <el-button @click="editCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editCateInfo">确 定</el-button>
  </span>
</el-dialog>

</div>

</template>

<script>
export default {
    data(){
        return{
            querInfo:{
                type: 3,
                pagenum : 1,
                pagesize: 5
            },

        // 商品分类的数据列表，默认为空
        catelist: [],
        total: 0,
        //为tree-table指定列的定义
        columns: [
            {
                label: '分类名称',
                prop: 'cat_name'
            },
            {
                label: '是否有效',
                //将当前列定义为模板列
                type: 'template',
                //当前这一列使用的模板名称
                template: 'isok'
            },
            {
                label: '排序',
                type: 'template',
                template: 'sort'
            },
            {
                label: '操作',
                type: 'template',
                template: 'opt'
            }
        ],

        //添加分类的对话框
        addCateDialogVisiable : false,

        //添加分类的表单数据对象
        addCateForm : {
            cat_name: '',
            //父级分类的ID
            cat_pid : 0,
            //分类等级 默认一级分类
            cat_level: 0
        },
        editCateForm:{
            cat_name: '',
            cat_id:''
        },
        editCateFormRules:{
            cat_name:[
                {
                    required: true,
                    message: '输入分类名称',
                    trigger: 'blur'
                }
            ]
        },
        
        //添加分类的验证规则对象
        addCateFormRules:{
            cat_name:[
                {
                    required : true,
                    message: '输入分类名称',
                    trigger: 'blur'
                }
            ]
        },
        //父级分类的空列表
        parentCateList: [],
        //指定级联选择器的配置对象
        cascaderProps: {
            value: 'cat_id',//具体选中的值
            label: 'cat_name',//看到的属性
            children: 'children' //父子嵌套用的属性
        },
        //选中的父级分类的ID数组
        selectedKeys: [],

        //编辑分类名称的对话框
        editCateDialogVisible: false


        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        //获取商品分类数据
        async getCateList(){
            const {data: res} = await this.$http.get(`categories`,{params: this.querInfo})
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist = res.data.result
            this.total = res.data.total
        },

        //监听pagesize改变
        handleSizeChange(newSize){
            this.querInfo.pagesize = newSize
            this.getCateList()
        },
        //监听pagenum的改变
        handleCurrentChange(newPage){
            this.querInfo.pagenum = newPage
            this.getCateList()
        },
        //添加分类监听按钮
        showaddCateDialog(){
            this.getParentCateList()
            this.addCateDialogVisiable = true
        },
        //获取父级分类的数据列表
        async getParentCateList(){
           const {data: res} = await this.$http.get(`categories`,{ params:
            { type: 2 }
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取父级分类的数据失败')
            }
            
            this.parentCateList = res.data
            console.log(res.data)

        },
        parentCateChanged(){
            // console.log(this.selectedKeys)
            if(this.selectedKeys.length > 0){
                this.addCateForm.cat_pid =  this.selectedKeys[this.selectedKeys.length-1]
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            }else
            {
                this.addCateForm.cat_pid = 0
                this.addCateForm.cat_level = 0
            }
        },
        //点击确定按钮  监听事件 发送请求
        addCate(){
            console.log(this.addCateForm)
            // validate中指定一个回调函数  拿到校验的结果valid  Ref校验对象
            this.$refs.addCateFormRef.validate( async valid => {
                if(!valid){
                    return
                }
                // categories请求地址   this.addCateForm 请求体
                const {data: res} = await this.$http.post(`categories`,this.addCateForm)
                if(res.meta.status !== 201){
                    return this.$message.error('添加分类失败')
                }
                this.$message.success('添加分类成功')
                this.getCateList()
                this.addCateDialogVisiable = false
            })


        },
        //监听对话框的关闭事件 重置表单数据
        addCateDialogClosed(){
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
        },
        async showeditCate(id){
            const{data: res} = await this.$http.get('categories/'+id)
            if(res.meta.status !== 200){
                return this.$message.error('查询分类名称失败')
            }
            this.editCateForm = res.data
            this.editCateDialogVisible = true
        },
        editCateInfo(){
            this.$refs.editCateFormRef.validate(async valid =>{
                if(!valid){
                    return
                }
                const{data: res} = await this.$http.put(`categories/`+this.editCateForm.cat_id,{
                    cat_name: this.editCateForm.cat_name,
                    cat_id: this.editCateForm.cat_id
                })
                if(res.meta.status!==200){
                    return this.$message.error('修改分类名称失败')
                }
                this.editCateDialogVisible = false
                this.getCateList()
                return this.$message.success('修改分类名称成功')
            })
        },
        //关闭对话框重置表单
        editCateClosed(){
            this.$refs.editCateFormRef.resetFields()
        },

        //删除分类
        async deleCate(id){
            const confirmResult = await this.$confirm('此操作将永久删除该分类, 是否继续?','提示',{
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error)
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除')
            }
            const {data : res} = await this.$http.delete('categories/'+id)
            if(res.meta.status!==200){
                return this.$message.error('删除分类失败')
            }
            this.$message.success('删除分类成功')
            this.getCateList()
        }
    }
}
</script>

<style scoped>
.treetable{
    margin-top: 15px;
}
.el-cascader{
    width: 100%;
}
</style>
